exam Maths Puzzle Numerical Ability

write the equation and graph using:
slope: -2 y int: (0,4)

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exam Other Question

The pressure P of a gas at constant temperature varies inversly as the volume V. If V +600 inches cubed when P+45 lbs/inches squared, what is P when V+ 54 inches cubed? suppose f(x)=2x+5 and g(x)= -1/3x +2. Find each value.
1) 2g(7)

can someone explain this to me?